Record-high thermal stability achieved in a novel single-component all-organic ferroelectric crystal exhibiting polymorphism

2019 ◽  
Vol 55 (65) ◽  
pp. 9610-9613 ◽  
Author(s):  
Sanjay Dutta ◽  
Vikas Vikas ◽  
Ashok Yadav ◽  
Ramamoorthy Boomishankar ◽  
Anu Bala ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
High Thermal Stability ◽  
Single Component ◽  
Ferroelectric Crystal ◽  
Polymorphic Modifications

A novel single-component organic ferroelectric crystal is reported to persist in its phase up to a record-high temperature (521.2 K) and undergoes polymorphic modifications afterwards.

High Thermal Stability of Mo/Si3N4/Mo/Si3N4/SiO2 Multilayer Solar Selective Coatings

2015 ◽  
Vol 1102 ◽  
pp. 67-71 ◽  
Author(s):  
Rui Hua Yang ◽  
Jin Yang Liu ◽  
Li Mei Lin ◽  
Fa Chun Lai ◽  
Yan Qu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Multilayer Structure ◽  
High Thermal Stability ◽  
Solar Absorptance ◽  
Selective Coating ◽  
Thermal Emittance ◽  
Quartz Substrates ◽  
Thermal Stability Of

In terms of good optical properties and high thermal stability, Mo/Si3N4/Mo/Si3N4/SiO2 coatings based on metal/dielectric multilayer structure were adapted to the solar selective coating at high operating temperatures. The coatings exhibited high solar absorptance in the range of 0.924 ~ 0.936 and low thermal emittance of 0.114 ~ 0.118. The coatings deposited on quartz substrates were thermally stable up to 625 °C in air for 2 h, while they were degraded at 650 °C from the characterization of the absorptance and emittance. The degradation of the coatings was mainly due to the oxidation of molybdenum in air, which was confirmed by Raman spectroscopy. Compared with the thermal stability in air, the coatings were much more stable in vacuum under high temperature. The remarkable thermal stability of the Mo/Si3N4/Mo/Si3N4/SiO2 coatings in air and in vacuum makes them suitable to be applied at high temperature applications.

scholarly journals Glycol-functionalized ionic liquids for high-temperature enzymatic ring-opening polymerization

RSC Advances ◽  
2018 ◽  
Vol 8 (63) ◽  
pp. 36025-36033 ◽  
Author(s):  
Hua Zhao ◽  
Lennox O. Afriyie ◽  
Nathaniel E. Larm ◽  
Gary A. Baker
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Ionic Liquids ◽  
High Temperature ◽  
High Molecular Weight ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
High Thermal Stability ◽  
Polymerization Reaction

New glycol-functionalized ionic liquids exhibit high thermal stability and are lipase-compatible, leading to a high molecular weight of polyester in the enzymatic ring-opening polymerization reaction.

Study on the Complex Strengthening Processes of 5Cr2NiMoVSi Steel Large Hot Forging Dies

2011 ◽  
Vol 189-193 ◽  
pp. 1056-1061 ◽  
Author(s):  
Jian Xin Kuang ◽  
Xin Heng Wang ◽  
An Min Liu ◽  
Hang Sheng Zhu
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
High Temperature Oxidation ◽  
Hot Forging ◽  
Front Axle ◽  
High Thermal Stability ◽  
Micro Hardness ◽  
Large Forging ◽  
Temperature Oxidation ◽  
Boron Penetration

To meet the high requirements of fatigue strength and thermal stability for the large forging dies, the complex strengthening process tests of new high thermal stability die steel 5Cr2NiMoVSi were done. This complex strengthening process was nickel plating the RE boron penetration→ pre-cool quenching → high temperature tempering. The results show that the surface micro-hardness, high temperature oxidation resistance, thermal fatigue resistance and wear resistance of 5Cr2NiMoVSi steel can greatly be improved by these processes. It has achieved significant results for auto front axle large forging dies by using the materials and processing technology.

scholarly journals Enhanced Electrical Properties of Lead-Free Piezoelectric KNLN-BZ-BNT Ceramics With the Modification of Sm3+ Ions

2021 ◽  
Vol 8 ◽  
Author(s):  
Yi Quan ◽  
Lingyan Wang ◽  
Wei Ren ◽  
Jinyan Zhao ◽  
Jian Zhuang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Electrical Properties ◽  
Piezoelectric Properties ◽  
Piezoelectric Ceramics ◽  
High Thermal Stability ◽  
Lead Free ◽  
Environment Friendly ◽  
Good Thermal Stability ◽  
Good For

Environment-friendly lead-free piezoelectric ceramics with great properties and high thermal stability are desired in the industry. In this work, the Sm3+-modified lead-free 0.915(K0.45Na0.5Li0.05)NbO3–0.075BaZrO3–0.01(Bi0.5Na0.5)TiO3 (KNLN-BZ-BNT) ceramics are prepared. The piezoelectric properties are improved with the introduction of Sm3+, and the optimal properties (d33 = 325 pC/N and d33* = 384 pm/V) are achieved in the ceramic modified with 0.3 mol% Sm3+ ions. Meanwhile, this sample shows good thermal stability such that the values of d33* decreased less than 20% when the temperature raised from 30 to 180oC. These results show the Sm3+-modified KNLN-BZ-BNT ceramics are good for further applications even under high temperature.

Superhydrophobic and elastic silica/polyimide aerogel based on double confinement growth strategy of the co-sol system

2022 ◽  
Author(s):  
Zhou Xiao ◽  
Jing Che ◽  
Huaxin Li ◽  
Xian Yue ◽  
Xianbo Yu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
High Temperature ◽  
High Thermal Stability ◽  
Growth Strategy ◽  
Low Thermal Conductivity

Polyimide (PI) aerogels with high thermal stability and low thermal conductivity can be used in the field of high temperature insulation. However, the super-hydrophilicity of PI aerogel will cause the...

scholarly journals High Thermal Stability of κ-Ga2O3 Grown by MOCVD

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 446
Author(s):  
Junhee Lee ◽  
Honghyuk Kim ◽  
Lakshay Gautam ◽  
Manijeh Razeghi
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Gallium Oxide ◽  
Chemical Vapor ◽  
High Thermal Stability ◽  
Organic Chemical ◽  
High Electrical Resistivity ◽  
Metal Organic ◽  
Organic Chemical Vapor Deposition ◽  
Thermal Stability Of

We report a high thermal stability of kappa gallium oxide grown on c-plane sapphire substrate by metal organic chemical vapor deposition. Kappa gallium oxide is widely known as a metastable polymorph transitioning its phase when subjected to a high temperature. Here, we show the kappa gallium oxide whose phase is stable in a high temperature annealing process at 1000 °C. These oxide films were grown at 690 °C under nitrogen carrier gas. The materials showed high electrical resistivity when doped with silicon, whereas the film conductivity was significantly improved when doped with both indium and silicon. This work provides a pathway to overcoming limitations for the advance in utilizing kappa gallium oxide possessing superior electrical characteristics.

scholarly journals Highly Stable Organosilicon Electrolytes for Li-ion Batteries

2014 ◽  
Author(s):  
Robert M West ◽  
Robert Hamers ◽  
Monica Usrey ◽  
Michael Pollina ◽  
Tobias Johnson ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Good Alternative ◽  
High Thermal Stability ◽  
Commercial Application ◽  
Li Ion Batteries ◽  
Current Standard ◽  
Li Ion ◽  
Large Effort ◽  
And Performance

During the last two decades, a large effort has been devoted to improve the safety and performance of Li-ion batteries. Current commercial electrolytes are based on highly flammable solvents that make them dangerous for certain applications. Organosilicon (OS) electrolytes are a good alternative to conventional carbonate electrolytes. Silatronix has developed many organosilanes containing ethylene oxide units for \(Li^+\) coordination. These OS have properties suitable for their use in electrolytes including high thermal stability, high flash point, low vapor pressure and relatively low viscosities. The OS electrolytes are less flammable than commercial electrolytes, hence improving the safety of the batteries and have shown a performance comparable with the current standard electrolytes when used in Li-ion coin cells. Fluoroorganosilanes (FOS) have been found to be the best candidates for commercial application and have been successfully tested in coin cells at high temperature.

High-Temperature Spin Crossover in Two Solvent-Free Coordination Polymers with Unusual High Thermal Stability

2015 ◽  
Vol 54 (6) ◽  
pp. 3006-3011 ◽  
Author(s):  
Wei Liu ◽  
Xin Bao ◽  
Jin-Yan Li ◽  
Yu-Lian Qin ◽  
Yan-Cong Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Coordination Polymers ◽  
Spin Crossover ◽  
High Thermal Stability ◽  
Solvent Free
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